Patent ReferencesInventorAssigneeApplicationNo. 06/811863 filed on 12/20/1985US Classes:417/395, Diaphragm91/347Coil spring moves laterally relative to coil axisExaminersPrimary: Smith, Leonard E.International ClassesF04B 9/127 (20060101)F01L 35/00 (20060101) F04B 9/00 (20060101) AbstractA single-acting, gas operated, pump method and apparatus including a pump body having a main chamber divided by a reciprocating piston assembly into a gas driving chamber and a liquid pumping chamber, a spring for biasing the piston assembly into one of its two end positions, a reciprocating control valve controlling the flow of driving gas to and from the gas driving chamber, a snap-acting spring mechanically coupling the control valve to the reciprocating movement of the piston assembly, and a counteracting spring for biasing the control valve toward one of its two positions. | |